Telephone set.



c. H. LEHMAN.

TELEPHONE sE. l APPLIFAUO FILED AUG.2I, 1911.

Patented 0st. 15, i915 ran lil FFQ.

CHARLES H. LEHMN, GF NEW YORK,N. Y., ASSGNOR T0 GENERAL ACOUSTIC COMPANY, A CORIORATION OF NEW YORK.

TELEPHONE SET.

Application led August 21, 1917.

To ali 'whom t may concern.'

Be it known that I, CHARLES H. LEHMAN, a citizen of the United States, residing at the city of New York, in the borough of Manhattan and State of New York, have invented certain new and useful Improvements in Telephone Sets, of which 'the following is a full, clear, and exact description. This invention relates to telephone sets and more particularly to sets which are housed in a box or casing' when not in use.

One of the objects of the invention is to provide an instrument of this character in which the transmitter and receiver are not only protected by the casing, but also coperate to eifectually form a seal for each other when the box or casing is closed, thereby adapting the instrument for use upon shipboard, in mines, or in other localities where there is excessive moisture present.

Other objects of the invention are to provide an instrument of the character' referred to in which the transmitter and receiver are constructed and arranged so that they are ready for use when the cover of the box is open Without requiring the transmitter or receiver to be removed from the box or to be held in the handwhile talking.

Other objects of the invention will be apparent from the detailed description hereinafter to follow and the novelfeatures of the invention will be set forth in the claims appended hereto.

In the drawings:

Figure 1 shown in perspective a telephone set with the casinar open, the parts being constructed in accordance with the principles of the invention; and

Fig. 2 is a vertical section through the casing showing the position of the receiver and transmitter when in this position.

The telephone set comprises a transmitter 1 and a receiver 2 to which is connected a horn 3. The transmitter 1 is preferably of the sensitive type which does not require the person talking to place his mouth close to the-transmitter. Such transmitters are in common use at the present time and form a part of the well known dictograph s ys-l tem which are used as intercommunicatmg systems in oices and in other places. As will be clear from Fig. l, the transmitter comprises a cylindrical casing which incloses the diaphragm and has a series of holes or openings 10 therein which are arranged in Specification of Letters Patent.

Serial No. 187,370.

electrical parts of the receiver are inclosed within a casing 3 which is shown in Fig. 2 and which is moisture-tight extcept for the opening inte which the small end of the horn I'its. The transmitter and receiver are mounted Within a box which comprises a body portion i and a cover 5 which are I ted sound waves clearly understood. The

hinged together as at 6. The cover 5 of the box is preferably provided with a flange so that when the box is closed, it is substantially water-tight and moisture proof.

In the preferred form of the invention,

the transmitter 1 is fastened to the cover by a bracket 7 or in any suitable manner. The receiver is fastened to the wall of the body portion 4 by brackets 8 and 9 so that it is rigidly mounted within the body portion of the box. The mouth of the horn 3 is provided with a rubber gasket 12 and the transmitter and receiver are so mounted on the respective parts of the box that when the cover 5 of the box is closed, the rubber gasket 12 will bear avainst the annular surface 1l to form an eectual seal for both the transmitter and receiver, which will prevent any moisture from entering the transmitter through Atheholes 10 and will also preventv any moisture :from reaching the electrical parts of the receiver through the mouth of the horn `3. Since the casings of both. the transmitter and the receiver are moistureproof at all other points, these parts when in closed position are, therefore, protected against moisture by their coperation with. each other, as well as by the moisture-proof box in which they are inclosed.

The wircs'leading to the transmitter are indicated at 13 and 14 and the wires to the receiver at 15 and 16. These wires lead to a small junction board lZ from which the wires, which connect the telephone set to another instrument, are connected by wires forming a cable 18. rlhe cable 18 leads into the box or housing through an opening 19 which issurroundedV by a rubber gasketQ which serves to render the housing or box moisture-proof at this pointa it being underwhich Will cause his ear to be adjacent the loud-speaking receiver. B oth hands are therefore free during conversation over the -set and slnce a sensitive transmltter and a loud-speaking receiver are utilized, the operator may hear Without diiiiculty even though his mouth and ear are at some distance from the transmitter and receiver permitting the f instrument to be used with the least possible inconvenience.

I claim:

l. A Weather-proof box comprising two sections, one of which is movable With respect to the other, one section carrying a telephone receiver and the other a telephone transmitter, both of which are Wholly inclosed when the box is closed, the two instruments having weies coperating abutting surfaces which, when the box is closed, form a moisture-proof joint Which excludes moisture from the interior of both instruments.

2. A Weather-proof box comprising two sections7 one of which is movable with respect to the other, and one having Walls which overlap those of the other, a telephone receiver xed in one section, and a telephone n transmitter fixed in the other section, said instruments having cooperating abutting surfaces which seal the interior of said instruments when the box sections are brought into overlapping closed relation.

3. In a telephone set, a box comprising two hinged sections, a telephone transmitter mounted in one of said sections comprising a cylindrical casing having sound-Wave openings in its front section, a telephone receiver mounted in the other of said box sections having a horn through which the sound- Waves emanate, said transmitter being arranged to close the m'outh of said horn When the box is in closed position, and a rubber gasket carried by one of said parts for providing a moisture-proof closure between said vtransmitter and receiver when the box is in* closed position.

ln Witness whereof, l subscribe my s1gnature..

eisernes' ir. LEHMAN. 

